s3-backer ☆

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Description:
FUSE-based single file backing store via Amazon S3

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: s3 fuse backup cloud-storage block-device

Install: brew install s3-backer

About:
S3Backer is a FUSE-based filesystem driver that presents an Amazon S3 bucket as a single contiguous file, functioning like a network-backed block device. This allows standard tools like dd, fsck, and backup utilities to operate on cloud storage as if it were a local file. Its main value proposition is enabling efficient, block-level backups and disk image storage in the cloud without requiring a full cloud sync client.

Key Features:

FUSE-based block device emulation
Configurable block size and zero-detection
Support for encryption and compression
Incremental backup capabilities via block checksums

Use Cases:

Creating remote, block-level backups of local disks
Storing large disk images or virtual machine volumes in S3
Mounting S3 storage as a raw file for legacy tools

Alternatives:

s3fs – S3FS presents a bucket as a directory tree, whereas S3Backer presents it as a single file suitable for block devices.
rclone – Rclone is a sync tool for files and directories, while S3Backer is specifically designed for block-level access.

Version History

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